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	<h2> 提交记录 9298 </h2>
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					<th class="col-xs-2"> 用户 </th>
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					<td style='font-size:13px'> <a href='/user/profile/Jazengm/index.html'> Jazengm </a> </td>
<td> <a href='/problem/1002/index.html'> 1002. 测测你的多项式乘法 </a> </td>
<td> Accepted </td>
<td> 100 </td>
<td style='font-size:13px'> 694.254 ms </td>
<td style='font-size:13px'> 71 MB + 680 KB </td>
<td style='font-size:13px'> C++11 </td>
<td style='font-size:13px'> 1.72 KB </td>
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					<th class="col-xs-6"> 提交时间 </th>
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					<td style='font-size:13px'> 2019-04-22 20:10:00 </td>
<td style='font-size:13px'> 2019-04-22 20:10:04 </td>
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				<label for="code"> 代码 </label>
				<pre style="background-color:white"><code class="cpp">#include&lt;cmath&gt;
#include&lt;cstdio&gt;
#include&lt;cstring&gt;
#include&lt;algorithm&gt;

using std::swap;
using std::reverse;

const double eps(0.4), pi(acos(-1.0));

inline int toInt(double x) {return int(x+(x&gt;0? eps: -eps));}

struct C
{
    double r, i;
    C() {} C(double r): r(r), i(0) {}
    C(double r, double i): r(r), i(i) {}

    inline C operator +(C c) {return C(r+c.r, i+c.i);}
    inline C operator -(C c) {return C(r-c.r, i-c.i);}
    inline C operator *(C c) {return C(r*c.r-i*c.i, r*c.i+i*c.r);}
    inline C conj() {return C(r, -i);}
};

inline void dFT(C* a, int s)
{
    static C b[1&lt;&lt;21|233];
    C *f(a), *g(b);
    for(int k(s&gt;&gt;1); k; k&gt;&gt;=1, swap(f, g))
        for(int i(0); i&lt;s&gt;&gt;1; i+=k)
        {
            C *g0(g+i), *g1(g+(s&gt;&gt;1|i)), *f0(f+(i&lt;&lt;1)), *f1(f+(i&lt;&lt;1|k)), ome(cos(2*pi*i/s), sin(2*pi*i/s));
            for(int j(0); j&lt;k; ++j)
            {
                C h(f1[j]*ome);
                g0[j] = f0[j] + h;
                g1[j] = f0[j] - h;
            }
        }
    for(int i(0); i&lt;s; ++i)
        a[i] = f[i];
}

inline void iDFT(C* a, int s)
{
    dFT(a, s);
    reverse(a+1, a+s);
    double k(1.0/s);
    for(int i(0); i&lt;s; ++i)
        a[i].r*=k, a[i].i*=k;
}

void poly_multiply(unsigned *a, int n, unsigned *b, int m, unsigned *r)
{
    int s(1);
    for(; s&lt;n+m+1; s&lt;&lt;=1);

    static C c[1&lt;&lt;21|233];
    for(int i(0); i&lt;s; ++i)
        c[i] = C(i&lt;=n? a[i]: 0, i&lt;=m? b[i]: 0);
    dFT(c, s);
    c[0] = c[0].r * c[0].i;
    c[s&gt;&gt;1] = c[s&gt;&gt;1].r * c[s&gt;&gt;1].i;
    for(int i(1); i&lt;s&gt;&gt;1; ++i)
    {
        C x(c[i]), y(c[s-i]);
        c[i] = (x+y.conj())*(x-y.conj())*C(0, -0.25);
        c[s-i] = (y+x.conj())*(y-x.conj())*C(0, -0.25);
    }
    iDFT(c, s);
    for(int i(0); i&lt;=n+m; ++i)
        r[i] = toInt(c[i].r);
}

</code></pre>
				<br />
				
				<label for="result"> 评测结果 </label><div class="row"><div class="col-xs-12"><div class="alert alert-success"><div class="text-center row"><table class="table table-borderless" style="margin:0px"><tr><td class="col-xs-2" style="vertical-align:middle;padding-left:20px;padding-right:20px"><b>Compilation</b></td><td class="col-xs-2" style="vertical-align:middle">N/A</td><td class="col-xs-2" style="vertical-align:middle">N/A</td><td class="col-xs-2" style="vertical-align:middle">Compile OK</td><td class="col-xs-2" style="vertical-align:middle">Score: N/A</td><td class="col-xs-2" style="vertical-align:middle"><a data-toggle="collapse" href="#detail_1" aria-expanded="false" aria-controls="detail_1">显示更多</a></td></tr></table></div><div class="collapse" id="detail_1"><br /><textarea class="form-control" style="background-color: white" rows="8" readonly>Compiling...
Compile success!
</textarea></div></div><div class="alert alert-success"><div class="text-center row"><table class="table table-borderless" style="margin:0px"><tr><td class="col-xs-2" style="vertical-align:middle;padding-left:20px;padding-right:20px"><b>Testcase #1</b></td><td class="col-xs-2" style="vertical-align:middle">694.254 ms</td><td class="col-xs-2" style="vertical-align:middle">71 MB + 680 KB</td><td class="col-xs-2" style="vertical-align:middle">Accepted</td><td class="col-xs-2" style="vertical-align:middle">Score: 100</td><td class="col-xs-2" style="vertical-align:middle"><a data-toggle="collapse" href="#detail_2" aria-expanded="false" aria-controls="detail_2">显示更多</a></td></tr></table></div><div class="collapse" id="detail_2"><br /><textarea class="form-control" style="background-color: white" rows="8" readonly>verdict = Run Finished
time_ms = 694.253595
mem_kb = 73384
Correct Answer
</textarea></div></div></div></div>
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